55646605661 has 16 divisors (see below), whose sum is σ = 58745064000. Its totient is φ = 52565355648.

The previous prime is 55646605649. The next prime is 55646605673. The reversal of 55646605661 is 16650664655.

It is an interprime number because it is at equal distance from previous prime (55646605649) and next prime (55646605673).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55646605661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55646605061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10910690 + ... + 10915788.

It is an arithmetic number, because the mean of its divisors is an integer number (3671566500).

Almost surely, 2^55646605661 is an apocalyptic number.

It is an amenable number.

55646605661 is a deficient number, since it is larger than the sum of its proper divisors (3098458339).

55646605661 is a wasteful number, since it uses less digits than its factorization.

55646605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6668.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 55646605661 in words is "fifty-five billion, six hundred forty-six million, six hundred five thousand, six hundred sixty-one".